EPRO PR6424/003-030 Eddy Current Sensor for Large Shaft Vibration and Position Monitoring

The EPRO PR6424/003-030 is a non-contact eddy current sensor designed to measure shaft vibration, axial position and other movement in large rotating machines. It is used in machinery monitoring systems for equipment such as steam turbines, gas turbines, compressors, pumps and generators.

Unlike a contact sensor, the PR6424 measures the gap between its probe tip and a metal shaft without touching the rotating surface. As the shaft moves, the gap changes and the sensor system converts this change into an electrical signal. The signal can then be used by a compatible monitoring system to track shaft movement and detect changes in machine condition.

The PR6424 uses a 16 mm probe tip and has a nominal sensitivity of 4 V/mm with a linearity error of no more than ±1.5%. Its static measurement range is ±2.0 mm, and its frequency response extends from DC to 20 kHz at the -3 dB point. These features make it suitable for applications that need both shaft position data and dynamic vibration measurements.

For maintenance and replacement work, the full model number matters. The probe must be matched with the correct signal converter, cable arrangement and target material to maintain the required measurement performance.

The 16 mm probe tip is designed for measuring shaft movement on large rotating equipment. The published sensitivity is 4 V/mm (101.6 mV/mil), with a linearity error of no more than ±1.5%. This defined output response helps the monitoring system convert measured gap changes into displacement values.

For accurate results, the probe should be installed at the correct gap and used with the matching signal converter. The target surface and shaft material must also meet the sensor's stated requirements.

The PR6424 has a specified frequency response of DC to 20 kHz (-3 dB). The DC response supports measurement of slow position changes, while the wider frequency range allows the system to capture faster shaft movement within the limits of the complete measurement chain.

This is useful when one monitoring arrangement needs to observe both changes in shaft position and dynamic vibration. Actual system performance still depends on the converter, installation, target and monitoring equipment.

1. Set the correct probe gap before commissioning. The probe gap affects the working point of the measurement system. Set the gap according to the manufacturer's installation instructions and the matching converter specification. Do not assume that any initial gap will provide the stated linear range. After installation, check the output and confirm that it falls within the expected operating range.
2. Check the shaft material and surface condition. The published PR6424 specification uses ferromagnetic steel as the standard target material. Differences in target material, surface condition or geometry can affect the relationship between gap and output. If the shaft material differs from the specified target, confirm that the system is suitable before relying on the readings.
3. Match the probe, cable and converter. The PR6424 must be used with a compatible signal converter and the correct cable arrangement. When replacing an installed sensor, check the complete part number, cable length, connector type, mounting dimensions and converter model. A probe that fits the mounting hole is not automatically an electrical match for the existing measurement system.

• Asia Pacific: China, South Korea, Japan, India, Southeast Asia
• Middle East: Saudi Arabia, UAE, Qatar
• North America: United States, Canada
• Europe: Germany, United Kingdom, France, Russia, Turkey
• Latin America: Brazil, Argentina, Mexico

• Rotating machinery online protection systems
• Vibration & shaft-position monitoring
• Steam turbine and compressor safety supervision
• Large fan, generator and high-speed pump condition monitoring
• Oil & gas facilities
• Chemical processing plants
• Power generation facilities
• Metal processing & coal-chemical plants

In a typical turbine maintenance task, a shaft-displacement channel may need a replacement sensor after a fault is found during a planned inspection. The maintenance team checks the original model, probe dimensions, mounting thread, cable arrangement and connected converter before selecting a replacement.

Where the installation requires the PR6424/003-030, matching the full configuration helps restore the original measurement chain. After installation, the team checks the probe gap and verifies the signal before returning the monitoring channel to service.

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• Professional installation required for optimal performance and safety
• Ensure proper mounting and adequate ventilation
• Comply with all applicable electrical safety standards